c++: for contracts, cdtors never return this

When targetm.cxx.cdtor_return_this() holds, cdtors have a
non-VOID_TYPE_P result, but IMHO this ABI implementation detail
shouldn't leak to the abstract language conceptual framework, in which
cdtors don't have return values.  For contracts, specifically those
that establish postconditions on results, such a leakage is present,
and the present patch puts an end to it: with it, cdtors get an error
for result postconditions regardless of the ABI.  This fixes
g++.dg/contracts/contracts-ctor-dtor2.C on arm-eabi.


for  gcc/cp/ChangeLog

	* contracts.cc (check_postcondition_result): Cope with
	cdtor_return_this.

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